Verifying catalysts in industrial gas reactions Steps:

• Reaction 1 is H₂ + N₂ → NH₃ (Haber-Bosch process); standard catalyst is iron, not nickel, so incorrect.
• Nickel catalyzes other reactions like fat hydrogenation, not ammonia synthesis industrially.
• Reaction 2 is O₂ + 2SO₂ → 2SO₃ (Contact process); catalyst is vanadium(V) oxide (V₂O₅), so correct.
• Thus, first catalyst wrong (no), second right (yes).

Why A is correct:

• A matches the facts: nickel is not the Haber catalyst (per standard catalysis in N₂ + 3H₂ ⇌ 2NH₃ equilibrium), while V₂O₅ enables SO₂ oxidation at 400–450°C.

Why the others are wrong:

• B: Reverses the truths—nickel isn't for ammonia, but V₂O₅ is for SO₃.
• C: Duplicate of A, but if distinct, assumes error in listing; still aligns but not needed.
• D: Falsely claims both correct, ignoring iron as Haber catalyst.

Final answer: A